mod_data_get_fields WS fails when a database without fields is used

Create a course with a database without adding fields. Enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a Token in the mobile app service for a user enrolled in the course where the database is: Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a CURL REST call simulating a WS client with the student token. You need to replace the wstoken, databaseid (with the database instance id) and the URL of your moodle instance curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'databaseid=13&wsfunction=mod_data_get_fields&wstoken=12a2a65aeea2a177055e233f9e303218&moodlewssettingfilter=true' | python -m "json.tool" Now check that in the curl response the fields attribute is an empty array